Loop-taker mounting means for sewing machines



July 28, 1953 E. M. HANF 2,646,766

LOOP-TAKER MOUNTING MEANS FOR SEWING MACHINES Filed Jan. 2. 1951Patented July 28, 1953 LOOP-TAKER MOUNTING MEANS FOR SEWING MACHINESEdward M. Hanf, Bridgeport, Conn., assignor to The Singer ManufacturingCompany, Elizabeth, N. J a corporation of New Jersey Application January2, 1951, Serial No. 204,046

6 Claims. (Cl. 112-196) This invention relates to sewing machines andmore particularly to a loop-taker housing and means for removablysecuring the housing to a sewing machine frame.

The present invention is particularly adapted for use with a two-threadlock-stitch sewing machine of the type employing either a rotary or anoscillating shuttle which is journaled within a housing which is adaptedto be detachably mounted upon the sewing machine frame.

It is a primary object of this invention to provide a loop-taker housingunit which may be readily and inexpensively attached to a sewing machineand which may with facility be replaced in the field by a new similarhousing unit in the event that the original unit becomes damaged byaccident or wear.

To the attainment of the ends in view, the invention comprises thedevices, combinations and arrangements of parts hereinafter describedand more particularly pointed out in the claims.

The features of the invention and the advantages attained thereby willbe readily understood by those skilled in the art from the followingdetailed description of a preferred embodiment of the inventionillustrated in the accompanying drawings in which:

Fig. 1 represents a front face view of a looptaker housing in which thepresent invention is incorporated, and as embodied in a sewing 'machineshown partly in section.

Fig. 2 represents a perspective view, partly in section, of the sewingmachine bed casting which carries the loop-taker housing.

Fig. 3 represents a perspective view of the inner face portion of theloop-taker housing with an oscillatory shuttle element mounted withinsuch housing.

Fig. 4 represents a fragmentary sectional view taken substantially alongthe line 44 of Fig. 1.

Fig. 5 represents a sectional view taken substantially along the line5-5 of Fig. 4.

Fig. 6 represents a perspective view of one of a pair of dowel pinsemployed in the present looptaker housing.

The sewing machine bed casting I is formed with a central supporting legI I, of which the sides are widened at I2, I2 and faced to form ar-cuateor segmental seats I3, I3 to which is secured by screws I 4, I4 aloop-taker housing of a type which is broadly disclosed in the E. B.Allen Patent No. 1,869,402, August 2, 1932;

Broadly, the present loop-taker housing comprises a pair of arcuatemembers I and I6 which are secured together by means of a pair of screwsI1, I! passing through aligned apertures in the members I5 and I6. Theexposed surface I8 of to the sewing machine frame ID, the surface I8 isdisposed in abutting relation with the complemental surfaces I3, I3.These surfaces I3, I3 and [8 are normally ground so as accurately toposition the loop-taker housing in proper alignment with the cooperatingactuating elements of the sewing machine. I

The inner cylindrical surface of the housing member I 6 is cylinderground, as at I9, to form a supporting hearing or raceway for thecircular bearing rib of the usual oscillatory shuttle 2| having aloop-seizing beak 22, a throat 23 and a heel 24, which throat and heelportions are engaged by the arms 25 and 26 of the usual oscillatoryshuttle driver 21 carried by the shuttledriving shaft 28 journaled atone end in the leg II. Whenever the loop-taker housing with its shuttle2| is mounted in its operative position, as illustrated in Fig. 1, theshuttle driver 2] functions to actuate the shuttle 2| in the usualmanner, and since this shuttle-driving mechanism is old and does notcome within the purview of the present invention, no further detaileddescription thereof will be presented herein.

As pointed out hereinabove, the present looptaker housing is adapted tobe secured to the sewing machine frame by means of a pair of screws I4,I4. The shank portion of each of these screws is adapted to be looselylocated within a respective one of the aligned apertures 29 formedwithin the housing elements I6 and I5, while the threaded end portion ofeach screw is threadedly received within a respective one of a pair ofapertures3fl provided in the surfaces I3, I3 of the frame member. Thisconstruction permits the loop-taker housing to be readily applied to andremoved from a sewing machine frame but, of course, means must beprovided for accurately locating the loop-taker housing relative to theshuttle driver 21, as well as to the reciprocatory needle 3 I. To thisend, the present invention contemplates the provision of a pair of dowelpins, of which each is designated by the numeral 32. Each of these dowelpins includes a cylindrical shank portion 33 as well as an enlarged headporelement I6, while the enlarged head portion 34' of the dowel pin isloosely received within a chamso as to impinge upon a respective one ofthe.

head portions 34 of the dowel pinstherebyto lock the dowel pin in aselective position of lateral adjustment.

In utilizing the present invention; the machine 4 frame It is firstprovided with-a p'air-of dowelpin receiving holes 38, 38, of which-eachis disposed within a flat surface Band is dimensioned so as snugly toreceive the shank portion 33of one of the dowel pins. housing, with itsset screws 37, 3'5 loosely positionedr-therein; is mounted in itscustomary locationi with the surface l8abutting the surfaces [3, I3-.=The housing is then adjusted so as to-cooperate: properly with theshuttle 2t and the needle-:31: Thereafter, the fastening screws M, l4are-tightened Withthe'frame holes disc as to lock the housing in a fixedposition; With the housmgsin this position, and with the dowel pinsreceived'within the holes 38; 38- of the sewing machine framepthesetscrews 3?, 3'! are tightened against each of the dowel pins so asto fixthem; in a given position within. the housing proper: Thereafter; ifitbecomes necessary to remove the-housing, it may with accuracy bereplacedupjon its-seats l 3; ion the. machine frame due tothefact'that'the :dowel pins. will function to relocatethehousing in itsinitial position.

Furthermore; it will be appreciated that in the event that the originalloop-taker housing be comes-idamagedeither by,'accident' or throughweanla-nd-ithasto:be replaced "in the field by a newr-housing, thepresent invention permits the oldhousingtobea' replaced with facilitydue to the: fact that a new housing with its laterallyadjustabledowel'pinscmay be readily applied tothe v sewing machineirrespective of the fact that the new housing was not manufacturedsolely for placement uponsaid sewing machine. Thus, those skilleddn theart will understand that the present loop-taker housing may be initiallyapplied toa sewing machine with greatfacility and at a-low' cost. and,furthermore, that it is also adapted to be. applied'as a replacem ntunit to a sewing machine-in'the field in the event that the originalhousing has become damaged. Also, itiisi to :be understood that thepresent constructiorrtwhich includes the laterally adjustable dowel pinsand their associated set screws aremost effi taken support for locking.:said dowel pin :in' .a .se-- lective' positionpofv lateral. adjustmentwithin its.

associated: apertures.

Thereafter, the loop-taker I 2. A loop-taker housing for removableattachment to a sewing machine having a pair of dowelpin receivingapertures, comprising, an annular loop-taker support having a pair ofcircumferentially spaced apertures therein, a pair of dowel pins eachlocated within a. respective one of said apertures and havingits-shank'diameter substantially less than the maximum width of itsassociated aperture so as to be laterally adjustable therewithin, eachof said dowel pins being longer than its associated aperture so as toproject outwardlyifromsaidloop-taker support, and means carried" by saidloop-taker support for locking each of said fdowel pins in a selectiveposition of lateral? adjustment. within its associated looptaker supportaperture.

3. A loop-taker housing for removable attachment to a sewing machinehaving a dowel-pin receiving aperture, comprising, a loop-taker supporthaving an aperture therein, a dowel pin formed-with a cylindrical shankand an enlarged head portion, saiddowel.pin having its-shank locatedwithin said loop-taker support aperture and having its shank diameter.substantially-less than .the max mum width of-said aperture .so as to belaterally-adjustable therewithin and having its shank formed longerthanits associated aperture so as to project outwardly from said looptaker.support, and meansincluding a-set screw threadedwithin said loop-takersupport for engagement with the head of saiddowel pin thereby to locksaiddowel.pin-inlaselective position of lateral adjustment-within itsassociated aperture.

4. A loop-taker housingfor removable attachment to a sewing machinehaving a. pair of dowelpin receiving. apertures, comprising, aloop-taker support including two annular memberssecured together along apair of abutting flat surfaces, one of said members being formed with apairof oircumferentiallyspaced apertures each leading from saidabuttingufiat surfaces to the outside of saidsupport, a pair of dowelpinseach located within a respective one of said support apertures andhaving. its shank diameter substantially less than the maximum .width ofits associated aperture so as to be laterally adjustable therewithin,each of said dowel pins-being longer than its associated aperture so asto project outwardly from said support, and means carriedhy the othersupportedmember for locking each of said dowel pins in a selectivepositionoflateraladjustment within its associated support aperture.

5. A loop-taker housing forreniovable attachment to a sewing machinehaving a pairof dowelpin receiving apertures, comprising, a loop-takersupport including two annular. members secured togetheralonga pairofabutting flat surfaces, one of said members being formed-wither. pair ofcircumferentially, spaced apertures leading to the outside of saidsupport and a pair ofcounterbores each .leadingfrom a-respective oneofnsaid support apertures to the abutting flat surfaces, a pair of@dowellpinseach formed with a cylindrical shankand an enlargedhead-portion and each being disposed with its shank and head portionspositioned respectively within one ofsaid support apertures andone ofsaid counterbores with the diameter of saidv shank and the-diameter ofsaid heacteachbeing, substantially less than the maximum Widthofitsassociated aperture or. counterbores so-as to be laterally adjustabletherewithin, each of said dowel pins havingits shank formed longer.than-its associated support aperture so asto projectoutwardly;from saidsupport, and apair. of set screws: each .-threaded within the other ofsaid support members for engagement with the head of a respective one ofsaid dowel pins thereby to lock said dowel pin in a selective positionof lateral adjustment within its associated aperture.

6. A sewing machine comprising, in combination, a frame having a flatsurface formed with a pair of spaced apertures therein, a loop-takersupport having a fiat surface complemental to said frame surface forremovable attachment in abutting relation therewith, said supportsurface being formed with a pair of spaced apertures complemental tosaid first mentioned apertures with respect to location but differentwith respect to their lateral dimensions, a pair of dowel pins eachlocated within a respective one of the larger pair of said apertureswith the shank diameter of each pin being substantially less than themaximum width of its associated larger aperture so as to be laterallyadjustable therewithin, each of said dowel pins being longer than itsassociated larger aperture and having its shank diameter substantiallyequal to the width of a respective one of said smaller apertures so asto fit snugls therewithin, and means associated with said looptakersupport for locking each of said dowel pins in a selective position oflateral adjustment within its associated larger aperture.

EDWARD M. HANF.

Name Date Allen Aug. 2, 1932 Number

